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This mock test of Current Electricity NAT Level - 2 for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Current Electricity NAT Level - 2 (mcq) to study with solutions a complete question bank.
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*Answer can only contain numeric values

QUESTION: 1

Figure shows a cell in which unit positive charge experience a constant non electric force of 10** N** and a constant electric force of 8

Solution:

** V** = Potential difference across the cell = Electric field × width of the cell

= 8 × 0.1 = 0.8

ε = emf of the cell = 10 × 0.1 = 1.0

The correct answer is: 1

*Answer can only contain numeric values

QUESTION: 2

In the circuit diagram shown if the current through the 1Ω resistor is then ** x** is :

Solution:

The correct answer is: 5

*Answer can only contain numeric values

QUESTION: 3

Consider the potentiometer circuit arranged as in figure. The potentiometer wire * AB * is 300

Solution:

When Jockey is not connected

Resistance per unit length

Let potential at ** C** is zero

Then apply Kirchoff’s Ist law

The correct answer is: 32

*Answer can only contain numeric values

QUESTION: 4

The circuit shown in the figure contains three resistors R_{1} =100Ω, R_{2} = 50Ω, and R_{3} = 50Ω and cells of emf’s E_{1} = 2V and E_{2}. The ammeter indicates a current of 50mA. Determine the current (mA) in the resistor R_{2} :

Solution:

Applying ** KVL** in loop

Current through

Current through

Applying

The correct answer is: 20

*Answer can only contain numeric values

QUESTION: 5

The efficiency of a cell when connected to a resistance * R* is 60%. What will be its efficiency (in %) if the external resistance is increased to six times.

Solution:

The correct answer is: 90

*Answer can only contain numeric values

QUESTION: 6

Find current in the branch ** CD** of the circuit (in ampere).

Solution:

From figure current through *B*** D** branch = 5

The correct answer is: 15

*Answer can only contain numeric values

QUESTION: 7

Two circular rings of identical radii and resistance of 36Ω each are placed in such a way that they cross each other’s centre **C**** _{1}** and

Solution:

From the figure.

** AC_{1} = AC_{2} = C_{1}C_{2}** = radius

Hence the resistance of four section are

Hence equivalent resistance ** R** across

The correct answer is: 100

*Answer can only contain numeric values

QUESTION: 8

In the circuit shown all five resistors have the same value 200 * ohms* and each cell has an emf 3

Solution:

In open circuit

** V_{AB}** = 4.2

The correct answer is: 42

*Answer can only contain numeric values

QUESTION: 9

All batteries are having *emf* 10 * volt* and internal resistance negligible. All resistors are in

Solution:

The simplified circuit is.

We have to find ** I**.

Let potential of point ‘

⇒ * x* – 10 + 2

The correct answer is: 70

*Answer can only contain numeric values

QUESTION: 10

Two cylinderical rods of uniform cross-section area A and 2A, having free electrons per unit volume 2n and n respectively are joined in series. A current I flows through them in steady state. Then the ratio of drift velocity of free electron in left rod to drift velocity of electron in the right rod is is :

Solution:

Since current ** I = neAv_{d}** through both rods is same

The correct answer is: 1

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